numbers

I have three text fields all which are numbers or a decimal number. They are accepted as strings which are later converted. However, i want to validate these fields so that only the numbers or decimal numbers are accepted. Whats the easiest way to ensure that these fields are only characters 0-9. I would prefer an if statement but any solution would be nice! Use string.matches method which accepts a regex as an argument. if(string.matches("\\d+(?:\\.\\d+)?")) { System.out.println("Matches"); } else { System.out.println("No Match"); } If you are inflating those textviews from xml you can just

Is it possible to localize numbers in String.format call the same way as NumberFormat.format does? I've expected it simply to use String.format(locale, "%d", number) but this doesn't return the same result as if using NumberFormat. For example: String.format(Locale.GERMAN, "%d", 1234567890) gives: "1234567890", while NumberFormat.getNumberInstance(Locale.GERMAN).format(1234567890) gives: "1.234.567.890" If it can't be done, what's recommended way for localizing text including numbers? From the documentation , you have to: supply a locale (as you are doing in your example) include the ',' flag

Is there an efficient algorithm to split up a number into N subsections so that the sum of the numbers adds up to the original, with a base minimum? For example, if I want to split 50 into 7 subsections, and have a base minimum of 2, I could do 10,5,8,2,3,5,17 (as well as any other number of combinations). I'd like to keep the numbers as integers, and relatively random but I'm not sure how to efficiently generate numbers that sum up to the original and don't include numbers lower than the given minimum. Any suggestions? EDIT - Just to copy/paste my comment, the integers don't have to be unique

Division by zero is not an error in JavaScript: it simply returns infinity or negative infinity. There is one exception, however: zero divided by zero does not have a well- defined value, and the result of this operation is the special not-a-number value, printed as NaN . NaN also arises if you attempt to divide infinity by infinity, or take the square in JavaScript root of a negative number or use arithmetic operators with non-numeric operands that cannot be converted to numbers. for Example 1. 0===0 returns True & 1==1 returns true 2. 0/0 returns NaN & 1/1 returns 1 Zero is Number and one is

I want to implement the Bessel functions of first and second kind Description of bessel functions for complex numbers in C++. Now I am looking for possibilities to introduce them in my source code. Since math.h only contains bessel functions for real numbers, I would be interested in seeing any kind of possibility. The Boost library implements ordinary Bessel functions of the first and second kind and modified Bessel functions of the first and second kind for both real and complex numbers (see documentation about Bessel functions ). Don't try to reinvent the wheel , just use the Boost

I need some easy way to divide 64b unsigned integers in assembler for x86. My number is saved in two 32b registers EDX:EAX and I need to put result back to EDX:EAX. Factor is in 32b integer. Some code, please? If I interpret your question correctly (particularly the part Factor is in 32b integer ), you want to divide a 64-bit dividend by a 32-bit divisor and get a 64-bit quotient. If that interpretation is correct, then it's actually easy to do in 32-bit code. The idea is that you divide both "halves" of the dividend by the divisor and reuse the remainder from the first division for the second